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annotate src/org/eclipse/jetty/http/AbstractGenerator.java @ 992:0608a6664bee
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Tue, 18 Oct 2016 15:23:25 -0600 |
parents | 23ec25435b8c |
children | 8c13b9224cff |
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1 // |
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2 // ======================================================================== |
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
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4 // ------------------------------------------------------------------------ |
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5 // All rights reserved. This program and the accompanying materials |
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6 // are made available under the terms of the Eclipse Public License v1.0 |
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7 // and Apache License v2.0 which accompanies this distribution. |
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8 // |
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9 // The Eclipse Public License is available at |
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10 // http://www.eclipse.org/legal/epl-v10.html |
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11 // |
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12 // The Apache License v2.0 is available at |
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13 // http://www.opensource.org/licenses/apache2.0.php |
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14 // |
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15 // You may elect to redistribute this code under either of these licenses. |
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16 // ======================================================================== |
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17 // |
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18 |
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19 package org.eclipse.jetty.http; |
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20 |
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21 import java.io.IOException; |
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22 |
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23 import org.eclipse.jetty.io.Buffer; |
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24 import org.eclipse.jetty.io.Buffers; |
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25 import org.eclipse.jetty.io.ByteArrayBuffer; |
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26 import org.eclipse.jetty.io.EndPoint; |
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27 import org.eclipse.jetty.io.EofException; |
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28 import org.eclipse.jetty.io.View; |
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29 import org.slf4j.Logger; |
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30 import org.slf4j.LoggerFactory; |
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31 |
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32 /* ------------------------------------------------------------ */ |
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33 /** |
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34 * Abstract Generator. Builds HTTP Messages. |
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35 * |
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36 * Currently this class uses a system parameter "jetty.direct.writers" to control |
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37 * two optional writer to byte conversions. buffer.writers=true will probably be |
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38 * faster, but will consume more memory. This option is just for testing and tuning. |
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39 * |
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40 */ |
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41 abstract class AbstractGenerator |
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42 { |
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43 private static final Logger LOG = LoggerFactory.getLogger(AbstractGenerator.class); |
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44 |
982 | 45 public static final boolean LAST=true; |
46 public static final boolean MORE=false; | |
47 | |
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48 // states |
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49 final static int STATE_HEADER = 0; |
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50 final static int STATE_CONTENT = 2; |
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51 final static int STATE_FLUSHING = 3; |
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52 final static int STATE_END = 4; |
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53 |
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54 // data |
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55 |
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56 final Buffers _buffers; // source of buffers |
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57 final EndPoint _endp; |
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58 |
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59 int _state = STATE_HEADER; |
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60 |
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61 int _status = 0; |
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62 int _version = HttpVersions.HTTP_1_1_ORDINAL; |
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63 Buffer _reason; |
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64 Buffer _method; |
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65 String _uri; |
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66 |
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67 long _contentWritten = 0; |
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68 long _contentLength = HttpTokens.UNKNOWN_CONTENT; |
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69 boolean _last = false; |
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70 boolean _head = false; |
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71 boolean _noContent = false; |
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72 Boolean _persistent = null; |
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73 |
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74 Buffer _header; // Buffer for HTTP header (and maybe small _content) |
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75 Buffer _buffer; // Buffer for copy of passed _content |
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76 Buffer _content; // Buffer passed to addContent |
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77 |
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78 |
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79 /* ------------------------------------------------------------------------------- */ |
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80 /** |
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81 * Constructor. |
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82 * |
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83 * @param buffers buffer pool |
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84 * @param io the end point |
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85 */ |
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86 AbstractGenerator(Buffers buffers, EndPoint io) |
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87 { |
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88 this._buffers = buffers; |
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89 this._endp = io; |
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90 } |
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91 |
982 | 92 /* ------------------------------------------------------------ */ |
93 /** | |
94 * Add content. | |
95 * | |
96 * @param content | |
97 * @param last | |
98 * @throws IllegalArgumentException if <code>content</code> is {@link Buffer#isImmutable immutable}. | |
99 * @throws IllegalStateException If the request is not expecting any more content, | |
100 * or if the buffers are full and cannot be flushed. | |
101 * @throws IOException if there is a problem flushing the buffers. | |
102 */ | |
103 public abstract void addContent(Buffer content, boolean last) throws IOException; | |
104 | |
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105 abstract boolean isRequest(); |
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106 |
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107 public final boolean isOpen() |
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108 { |
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109 return _endp.isOpen(); |
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110 } |
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111 |
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112 public void reset() |
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113 { |
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114 _state = STATE_HEADER; |
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115 _status = 0; |
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116 _version = HttpVersions.HTTP_1_1_ORDINAL; |
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117 _reason = null; |
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118 _last = false; |
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119 _head = false; |
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120 _noContent=false; |
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121 _persistent = null; |
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122 _contentWritten = 0; |
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123 _contentLength = HttpTokens.UNKNOWN_CONTENT; |
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124 |
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125 _content = null; |
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126 _method = null; |
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127 } |
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128 |
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129 public final void returnBuffers() |
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130 { |
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131 if (_buffer!=null && _buffer.length()==0) |
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132 { |
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133 _buffers.returnBuffer(_buffer); |
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134 _buffer=null; |
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135 } |
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136 |
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137 if (_header!=null && _header.length()==0) |
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138 { |
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139 _buffers.returnBuffer(_header); |
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140 _header=null; |
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141 } |
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142 } |
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143 |
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144 public final void resetBuffer() |
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145 { |
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146 if(_state>=STATE_FLUSHING) |
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147 throw new IllegalStateException("Flushed"); |
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148 |
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149 _last = false; |
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150 _persistent=null; |
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151 _contentWritten = 0; |
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152 _contentLength = HttpTokens.UNKNOWN_CONTENT; |
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153 _content=null; |
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154 if (_buffer!=null) |
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155 _buffer.clear(); |
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156 } |
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157 |
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158 /* ------------------------------------------------------------ */ |
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159 /** |
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160 * @return Returns the contentBufferSize. |
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161 */ |
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162 public final int getContentBufferSize() |
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163 { |
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164 if (_buffer==null) |
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165 _buffer=_buffers.getBuffer(); |
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166 return _buffer.capacity(); |
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167 } |
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168 |
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169 public final Buffer getUncheckedBuffer() |
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170 { |
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171 return _buffer; |
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172 } |
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173 |
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174 public final boolean isComplete() |
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175 { |
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176 return _state == STATE_END; |
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177 } |
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178 |
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179 public final boolean isIdle() |
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180 { |
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181 return _state == STATE_HEADER && _method==null && _status==0; |
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182 } |
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183 |
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184 public final boolean isCommitted() |
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185 { |
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186 return _state != STATE_HEADER; |
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187 } |
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188 |
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189 public final void setContentLength(long value) |
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190 { |
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191 if (value<0) |
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192 _contentLength=HttpTokens.UNKNOWN_CONTENT; |
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193 else |
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194 _contentLength=value; |
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195 } |
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196 |
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197 public final void setHead(boolean head) |
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198 { |
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199 _head = head; |
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200 } |
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201 |
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202 /* ------------------------------------------------------------ */ |
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203 /** |
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204 * @return <code>false</code> if the connection should be closed after a request has been read, |
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205 * <code>true</code> if it should be used for additional requests. |
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206 */ |
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207 public final boolean isPersistent() |
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208 { |
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209 return _persistent!=null |
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210 ?_persistent.booleanValue() |
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211 :(isRequest()?true:_version>HttpVersions.HTTP_1_0_ORDINAL); |
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212 } |
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213 |
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214 public final void setPersistent(boolean persistent) |
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215 { |
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216 _persistent = persistent; |
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217 } |
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218 |
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219 /* ------------------------------------------------------------ */ |
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220 /** |
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221 * @param version The version of the client the response is being sent to (NB. Not the version |
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222 * in the response, which is the version of the server). |
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223 */ |
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224 public final void setVersion(int version) |
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225 { |
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226 if (_state != STATE_HEADER) |
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227 throw new IllegalStateException("STATE!=START "+_state); |
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228 _version = version; |
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229 if (_version==HttpVersions.HTTP_0_9_ORDINAL && _method!=null) |
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230 _noContent=true; |
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231 } |
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232 |
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233 /* ------------------------------------------------------------ */ |
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234 /** |
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235 * @param status The status code to send. |
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236 * @param reason the status message to send. |
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237 */ |
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238 public final void setResponse(int status, String reason) |
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239 { |
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240 if (_state != STATE_HEADER) throw new IllegalStateException("STATE!=START"); |
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241 _method=null; |
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242 _status = status; |
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243 if (reason!=null) |
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244 { |
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245 int len=reason.length(); |
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246 |
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247 // TODO don't hard code |
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248 if (len>1024) |
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249 len=1024; |
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250 _reason=new ByteArrayBuffer(len); |
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251 for (int i=0;i<len;i++) |
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252 { |
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253 char ch = reason.charAt(i); |
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254 if (ch!='\r'&&ch!='\n') |
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255 _reason.put((byte)ch); |
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256 else |
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257 _reason.put((byte)' '); |
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258 } |
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259 } |
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260 } |
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261 |
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262 public final void completeUncheckedAddContent() |
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263 { |
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264 if (_noContent) |
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265 { |
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266 if(_buffer!=null) |
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267 _buffer.clear(); |
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268 } |
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269 else |
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270 { |
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271 _contentWritten+=_buffer.length(); |
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272 if (_head) |
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273 _buffer.clear(); |
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274 } |
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275 } |
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276 |
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277 public boolean isBufferFull() |
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278 { |
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279 if (_buffer != null && _buffer.space()==0) |
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280 { |
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281 if (_buffer.length()==0 && !_buffer.isImmutable()) |
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282 _buffer.compact(); |
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283 return _buffer.space()==0; |
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284 } |
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285 |
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286 return _content!=null && _content.length()>0; |
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287 } |
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288 |
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289 public final boolean isWritten() |
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290 { |
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291 return _contentWritten>0; |
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292 } |
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293 |
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294 public final boolean isAllContentWritten() |
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295 { |
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296 return _contentLength>=0 && _contentWritten>=_contentLength; |
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297 } |
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298 |
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299 public abstract void completeHeader(HttpFields fields, boolean allContentAdded) throws IOException; |
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300 |
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301 /* ------------------------------------------------------------ */ |
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302 /** |
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303 * Complete the message. |
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304 * |
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305 * @throws IOException |
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306 */ |
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307 public void complete() throws IOException |
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308 { |
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309 if (_state == STATE_HEADER) |
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310 { |
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311 throw new IllegalStateException("State==HEADER"); |
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312 } |
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313 |
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314 if (_contentLength >= 0 && _contentLength != _contentWritten && !_head) |
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315 { |
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316 if (LOG.isDebugEnabled()) |
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317 LOG.debug("ContentLength written=="+_contentWritten+" != contentLength=="+_contentLength); |
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318 _persistent = false; |
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319 } |
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320 } |
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321 |
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322 public abstract int flushBuffer() throws IOException; |
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323 |
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324 |
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325 public final void flush(long maxIdleTime) throws IOException |
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326 { |
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327 // block until everything is flushed |
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328 long now=System.currentTimeMillis(); |
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329 long end=now+maxIdleTime; |
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330 Buffer content = _content; |
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331 Buffer buffer = _buffer; |
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332 if (content!=null && content.length()>0 || buffer!=null && buffer.length()>0 || isBufferFull()) |
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333 { |
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334 flushBuffer(); |
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335 |
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336 while (now<end && (content!=null && content.length()>0 ||buffer!=null && buffer.length()>0) && _endp.isOpen()&& !_endp.isOutputShutdown()) |
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337 { |
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338 blockForOutput(end-now); |
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339 now=System.currentTimeMillis(); |
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340 } |
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341 } |
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342 } |
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343 |
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344 /* ------------------------------------------------------------ */ |
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345 /** |
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346 * Utility method to send an error response. If the builder is not committed, this call is |
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347 * equivalent to a setResponse, addContent and complete call. |
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348 * |
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349 * @param code The error code |
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350 * @param reason The error reason |
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351 * @param content Contents of the error page |
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352 * @param close True if the connection should be closed |
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353 * @throws IOException if there is a problem flushing the response |
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354 */ |
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355 public final void sendError(int code, String reason, String content, boolean close) throws IOException |
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356 { |
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357 if (close) |
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358 _persistent=false; |
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359 if (isCommitted()) |
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360 { |
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361 LOG.debug("sendError on committed: {} {}",code,reason); |
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362 } |
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363 else |
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364 { |
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365 LOG.debug("sendError: {} {}",code,reason); |
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366 setResponse(code, reason); |
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367 if (content != null) |
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368 { |
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369 completeHeader(null, false); |
982 | 370 addContent(new View(new ByteArrayBuffer(content)), LAST); |
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371 } |
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372 else if (code>=400) |
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373 { |
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374 completeHeader(null, false); |
982 | 375 addContent(new View(new ByteArrayBuffer("Error: "+(reason==null?(""+code):reason))), LAST); |
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376 } |
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377 else |
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378 { |
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379 completeHeader(null, true); |
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380 } |
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381 complete(); |
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382 } |
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383 } |
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384 |
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385 public final long getContentWritten() |
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386 { |
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387 return _contentWritten; |
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388 } |
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389 |
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390 |
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391 public final void blockForOutput(long maxIdleTime) throws IOException |
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392 { |
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393 if (_endp.isBlocking()) |
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394 { |
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395 try |
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396 { |
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397 flushBuffer(); |
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398 } |
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399 catch(IOException e) |
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400 { |
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401 _endp.close(); |
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402 throw e; |
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403 } |
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404 } |
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405 else |
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406 { |
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407 if (!_endp.blockWritable(maxIdleTime)) |
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408 { |
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409 _endp.close(); |
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410 throw new EofException("timeout"); |
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411 } |
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412 |
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413 flushBuffer(); |
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414 } |
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415 } |
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416 |
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417 } |